* vm_object_page_collect_flush() was trying to re-protect VM pages that
were still marked dirty after pageout I/O was initiated without owning
the BUSY bit on the page. This operation could race whatever I/O was
going on and multiple issues. Remove the re-protect.

Just don't do it. It's an unnecessary operation. We still re-set
PG_CLEANCHK on the page and that should be fine insofar as the pageout
daemon goes.